Malicious PDF — malware analysis report

Static analysis result for SHA-256 d69d03ca4a2baca4…

MALICIOUS

PDF

71.1 KB Created: 2021-09-29 09:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f308f6cfd71070ac1deb96bd474e65c5 SHA-1: 60f49de94655771ff0b9751bba9591c62fbb019c SHA-256: d69d03ca4a2baca474e4f39fad23c412f0a9e92509244f5af2d2ecfbed261f46
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of external URI links and link farm heuristics suggests the primary goal is to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=how+to+create+wifi+hotspot+android PDF link annotation
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b695da184---pezibumubavupowe.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/jupasamoxugaxi.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/89253117412.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/pomaxowafolazixuxedomimok.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/11118495850.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/18913986847.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/3501064160.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/mijijaziworip.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/robodofa.pdfIn macro / runtime command snippet
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/749557541.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/01bd59873a846315fd98a8e7538bf8ac/gixixupudiwibosinube.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/oeig9kqg7mdmf8hgkl9e6ggrj2/pozevumix.pdfIn PDF document text
    • http://imoroz.by/upload/file/xulutex.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/65911622701.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210902015121.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/dufakipilijatumajoro.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/91521465645.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614045f0f131c---nasix.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/xibuserogu.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/nobuv.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/jerafegumidisorulozejoj.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613118862fcc9---17102116801.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161366c32840c4---dopiv.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/pelajaxativosutal.pdfIn PDF document text
    • https://kindeeyudee.com/In macro / runtime command snippet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB5 10748 bytes
SHA-256: 56a15160ce14e96deebfdd8a86961d2346d6d5d6e404662343e501cd1b02caaa
font_02_sfnt_off0000e562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE562 16368 bytes
SHA-256: 97301d065cfa966c46d9fd5b74b4bdf41df7a5b1fbb323beecff05bbef67892f

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